All 3 Uses of

labyrinth
in
And The Mountains Echoed

He trailed the div through a labyrinth of hallways, the ceiling of each nearly scraped the clouds, each supported by enormous columns.†
Chpt 1

Across the street, next to a mosque with soaring minarets, was the bazaar, composed of congested labyrinths of both vaulted and open alleyways.†
Chpt 2 *

He said Jalozai had been like a city, a huge maze of tents and mud huts and homes built from plastic and aluminum siding in a labyrinth of narrow passageways littered with dirt and shit.†
Chpt 7

Definitions:

(1) (labyrinth)
a maze (a complex system of paths or tunnels in which it is easy to get lost)

or (figuratively): anything so complicated that it is extremely confusing

The word "labyrinth" comes from the name of the maze of passages where, in Greek mythology, Theseus had to escape from the Minotaur.
(2) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Less commonly, labyrinth can refer to a complex anatomical system of interconnecting cavities -- especially the inner ear